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Are you installing to a local or remote SQL server? Are you using an existing db user or letting the installer create a new one?
I beleive this will fix your problem:
http://dotnetcake.blogspot.se/2012/06/installing-episerver-6-r2-on-windows-8.html
I can confirm instructions on the page Klas suggested work perfectly. One thing I didn't notice it mention was to change the IIS registry value back to 8 after install. This is important for the stability of IIS (patches, other sites, etc.) in future but doesn't affect your server install otherwise and IIS's backward compatibility is superb anyway.
Hi there;
I got this error while installing EPiServer CMS Site with SQL Server Database (The Alloy Tech Sample Site):